Wave-meter.



No. 848,675. PATENTED APR. 2, 1907. J. MURGAS.

WAVE METER.

APPLIOATION FILED JAN. 29, 1906.

2 SHEBTS-SHBET l alibi/M143 PATENT OFFICE;

JOSEPH MURGAS, 0F WI-LKES-MBAR-RE, PENNSYLVANIA.

WAVE-METER.

$pecifloat ion of Letters Patent.

Patented April 2, 19(2'2'.

Application filed January 29,1906. Serial No. 298,466,

T0 ltd/l wlwm it may concern:

Be it known that I, J OSEPH MURGAS, a citizen of the United States, residing at \Nilkes- Barre, in the county of Luzerne, State of Pennsylvania, have invented certain new and useful Improvements in Wave-Meters, of which the following is a specification.

The present invention relates to means'for measuring the lengths of the waves in electric oscillation systems--as, for instance, Wireless-telegraph systems and since the determination oi the wavelength involves a determination of the frequency the invention also relates to means for measuring the frequency in systems of the character described.

The object of the invention is to provide improved means for attaining the results indicated above and can be best ex lained in connection with its illustration in t e accompanying drawings, of which Figure 1 is a diagram of connections of the wave-meter and suflicient of the a aratus of a system to which'it is applied to iliiistrate its application. Fig. 2 is a side view of an electrostatic means which is preferably employed for coupling the wave meter with the system to be examined. Fig. 3 is a side ele-- vationof the inductance-coil. Fig. 4 is a cross-section thereof. Fig. 5 is a longitudi nal section of the static telephone-receiver, and Fig, 6 is a perspective View thereof.

Referring to the drawings, the apparatus comprises an inductance-coil A, to one terminal a of which one terminal I) of an electrostatic telephone-receiver B is connected, the

other terminal 0 of the receiver having a connection with a sliding contact (1, bearing against the turns of the coil A. The other terminal c of the coil A is coupled with the system to be investigated, preferably by electrostatio means C, comprising opposed electrodes separated by'a dielectric. The system to be investigated is shown, for instance, as a well-known oscillator-circuit adapted for use "in a transmitter of a'Wireless-tele graph system and comprising an inductance f, a condenser g, and a s ark-gap h.

Preferably the close circuit, comprising the coil A and telephone-receiver, is coupled with the system under investigation through a conductor i of considerable Tength, so that the said circuit'will be removed from the range of the noise caused by the sparking at the gap h.

Referring particularly to Fig. 2, the-elec trostatic coupling means C, which may also be termed a still discharger, comprises an insulating-bar 1, on which are supported the opposed electrodes 2 and 3, the opposed ends of which are each provided with a plurality of needlelike prongs 4 and 5. Preferably the electrodes are mounted so as to be adjustable with relation to each other. This may be accomplished by mounting one or both of them upon screws, as shown. One of the electrodes is connected to a hook 6, which serves to make contact with the conductor to be examined, while the other electrode is connected with one terminal of the coil A by means of the wire 1'.

The telephone-receiver (see Fig. 5) may have the usual insulating-body 7, supporting the usual diaphragm 8, which constitutes one of the electrodes or plates of a condenser and is electrically connected to a terminal 0. The other electrode or plate 9 of the condenser secured to a screw 10, rotat ably mounted andadapted to engage with screw-threads in a metal plate l1, fixed tothe body and forming I an electrical connection between the elec-' trode 9 and the terminal b. The outer end of the screw is provided with a knurled head ing known, the capacity of the'device as acondenser can be readily ascertained by cal-1:,

culation in a well-known .way. Not only does this instrument act as a,condenser,-,bnt

the diaphragm is vibratedas the charges-pass electrostq-itically from the diaphra m to the other electrode and emits a soun which is louder as the charges are stronger, and there IOO fore a condition of resonance exists when the sound is loudest.

" The inductance-coil A (see Fig. 3) coniprises a suitably-supported core 15, of insuating material,.on which is wound a continuous insulated conductor 16, each turn of which has a ha red portion, as shown, so that a sliding contact (1 may contact successively with them as it is moved longitudinally of the coil. The contact d is mounted upon an insulating sliding carriage 18, which also carries a terminal 19 for efiecting connection 

